After initial mixing of a wastewater discharge in a 5-m-deep river, the DO concentration in the river is 7 mg/L and the temperature is 22°C. The average flow velocity in the river is 6 cm/s.(a) If the ultimate BOD of the mixed river water is 15 mg/L, the rate constant for BOD at 20°C is 0.5 d−1, there is negligible removal of BOD by sedimentation, and the reaeration rate constant at 20°C is 0.7 d−1, estimate the minimum DO concentration in the river.(b) How far downstream of the outfall location will the minimum DO concentration occur? 4.25. After initial mixing of a wastewater discharge ina 5-m-deep river, the DO concentration in theriver is 7 mg/L and the temperature is 22°C. Theaverage flow velocity in the river is 6 cm/s.(a) If the ultimate BOD of the mixed river wateris 15 mg/L, the rate constant for BOD at 20°Cis 0.5 d-1, there is negligible removal of BODby sedimentation, and the reaeration rateconstant at 20°C is 0.7 d', estimate theminimum D0 concentration in the river.(b) How far downstream of the outfall locationwill the minimum DO concentration occur?

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Answered: After initial mixing of a wastewater…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

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After initial mixing of a wastewater discharge in a 5-m-deep river, the DO concentration in the river is 7 mg/L and the temperature is 22°C. The average flow velocity in the river is 6 cm/s.
(a) If the ultimate BOD of the mixed river water is 15 mg/L, the rate constant for BOD at 20°C is 0.5 d−1, there is negligible removal of BOD by sedimentation, and the reaeration rate constant at 20°C is 0.7 d−1, estimate the minimum DO concentration in the river.
(b) How far downstream of the outfall location will the minimum DO concentration occur?

4.25. After initial mixing of a wastewater discharge in
a 5-m-deep river, the DO concentration in the
river is 7 mg/L and the temperature is 22°C. The
average flow velocity in the river is 6 cm/s.
(a) If the ultimate BOD of the mixed river water
is 15 mg/L, the rate constant for BOD at 20°C
is 0.5 d-1, there is negligible removal of BOD
by sedimentation, and the reaeration rate
constant at 20°C is 0.7 d', estimate the
minimum D0 concentration in the river.
(b) How far downstream of the outfall location
will the minimum DO concentration occur?

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